thanks, they do look like they should be able to be used in either. The longer stem I think is the uprated engines.

I am building a new engine as a future replacement for mine. it will still be a 616, but want to set it up so I can turbo it later. My current engine is doing ok but has a lot of miles on it, and is a bit tired. So I know sooner or later will need to do something.

__________________
1977 240D turbo